manitowoc BD0152A

[wannafreeze]

I can`t find anything other than the wiring diagram on their web site.I checked a B model machiene today.I didn`t have time to see the result of cleaning the condensor and evap.Didn`t bother checking a safety message,and left the place hoping that was it.After the first drop machiene stopped is what i am told.I believe the discharge thermistor was loose.Can you educate me on this thermistor and operation of this model.I am guessing if the thermistor is loose its seeing a cold discharge line during harvest and keeps the fan motor off and after ice droppes it causes high pressure safety to trip.

[wannafreeze]

also I wanted to ask about safety limit #3 and#4 I don`t remember which one is which.thanks.

[icemeister]

Safety limit #3 will shut down the machine if the discharge temperature falls below 85ºF during 3 cycles in a row. #4 is for discharge temps exceeding 255ºF.

Here's the link to the service manual for the B-Series single evaporator machines:
http://www.manitowocice.com/Service/ServiceManuals.asp#SINGLE

I've seen #3 safety shutdowns primarily in situations where there have been extended harvest times, usually due to dirty or failed evaporators. It's often a tossup whether you get a #2 or a #3 in those cases.

[JasonHoustonTX]

bringing up a old thread, but we have the same machine in our shop. We don't do refrigeration, but our machine runs for 2-3 days and will stop with a #2. We cleaned the coil but still run into this problem.

[Jabarco]

I didn`t have time to see the result of cleaning the condensor and evap.Didn`t bother checking a safety message,and left the place hoping that was it.

I know what you mean; I don't have time to answer your post either. I've got to go now; I have an ice machine I have to go fix.

I can't help it if you didn't have enough time!

[wannafreeze]

I know what you mean; I don't have time to answer your post either. I've got to go now; I have an ice machine I have to go fix.

I can't help it if you didn't have enough time!

Wiseguy,I agree it was a poor practice what I did two years ago when I was just learning how to do business with cheap people.Way before I decided to dump them all and work for the ones that can pay my time to watch their antique machines go through 3 cycles.

How did you find time to start only ONE post in six years you've been around this forum?The one you posted the picture of a suction coil critisizing something so easy that a first month tech school student could see that it was so wrong.
Don't answer my posts or anybody else's post if you have nothing useful to say.
Show me one post I got sarcastic with anybody's question if you think I deserve anybody's stupid,redundant remark.

[wannafreeze]

I can't help it if you didn't ....................!
You must realy like agitating people with this same type of remark.Every one of your replies end with the same negativity.
What's the problem?

[JasonHoustonTX]

holy crap.....all I wanted to do was ask a question. I didn't mean to start a war from 6 years ago.

Lets make Ice.....not war :)

[wannafreeze]

holy crap.....all I wanted to do was ask a question. I didn't mean to start a war from 6 years ago.

Lets make Ice.....not war :)
#2 is for 3 consecutive times long harvest.(3.5 min)
If you wonder what my problem was two years ago,I had a machine on an uneven floor.(therefore water was leaking into the bin.)I had a couple of trips there everytime for some reason they would push the machine.
Did you clean the evap? To start with..

[Jabarco]

Don't answer my posts or anybody else's post if you have nothing useful to say.

OK, OK, OK,......lighten up. I was just kidding. Geez!

Yes, I've seen your problem before. In my case, the TXV was underfeeding. BTW, it took some time to determine it was the TXV. I had to recover the refrigerant (HP81) charge and weigh it back in to manufacture's specs. Then I clamped a Fluke pipe thermometer next to the discharge line thermistor, disconnected the thermistor wires from the control board and on to a digital ohm meter and monitored the temperature & ohms to see if the machine's discharge temperature and the thermistor were performing to specs on page 6-24 & 6-25. http://www.manitowocice.com/Documents/MIIPublic/ServiceLit/Service_Manuals/B_Model/Dual_Evaporator/B_Dual_Section_6_pg_6-21_to_6-30_sm.pdf

I found the thermistor worked perfectly. Unfortunately, I found the discharge temperature exceeded 255°F (3.5K ohms) during the freeze cycle (about 8 minutes into the freeze cycle). Luckily for the customer, the ice machine was still under the manufacture's 3 years parts & labor warranty. Unfortunately for me, I was only allowed 4½ hours allowance from Manitowoc to make the repair, and I took me longer.

If you're lucky, only your thermistor will be faulty.

Jabs

[wannafreeze]

OK, OK, OK,......lighten up. I was just kidding. Geez!

Yes, I've seen your problem before. In my case, the TXV was underfeeding. BTW, it took some time to determine it was the TXV. I had to recover the refrigerant (HP81) charge and weigh it back in to manufacture's specs. Then I clamped a Fluke pipe thermometer next to the discharge line thermistor, disconnected the thermistor wires from the control board and on to a digital ohm meter and monitored the temperature & ohms to see if the machine's discharge temperature and the thermistor were performing to specs on page 6-24 & 6-25. http://www.manitowocice.com/Documents/MIIPublic/ServiceLit/Service_Manuals/B_Model/Dual_Evaporator/B_Dual_Section_6_pg_6-21_to_6-30_sm.pdf

I found the thermistor worked perfectly. Unfortunately, I found the discharge temperature exceeded 255°F (3.5K ohms) during the freeze cycle (about 8 minutes into the freeze cycle). Luckily for the customer, the ice machine was still under the manufacture's 3 years parts & labor warranty. Unfortunately for me, I was only allowed 4½ hours allowance from Manitowoc to make the repair, and I took me longer.

If you're lucky, only your thermistor will be faulty.

Jabs

I hear that Hoshi thermistors almost never fail.Is it the same for Manit?

[Jabarco]

Oh! Wait a minute, is your HPS tripping? If yes, disregard my previous reply.

The thermistor has nothing to do with a HPS trip. It only monitors the compressor's discharge line temperature.

Jabs

[Jabarco]

I hear that Hoshi thermistors almost never fail.Is it the same for Manit?

I've worked on just as many Hoshizakis as Manitowocs and I have never seen a bad Hoshizaki thermistor, but I have seen a couple of bad Manitowoc thermistors.

Jabs

[DoctorIce]

The Hoshi thermistor almost never fails. I've used Hoshis to replace Kold-Draft thermistors and vice versa. The Manitowoc thermistor I just eliminate by connecting the leads to a 1/2 watt 47K resistor. I got this tip from Manitowoc.

[wannafreeze]

OK, OK, OK,......lighten up. I was just kidding. Geez!
Jabs

Hey Jabs,I was going over this thread again.I noticed my overreaction that day.Didn't know your style and had a rough day.A delayed SORRY.:o

[Jabarco]

Hey Jabs,I was going over this thread again.I noticed my overreaction that day.Didn't know your style and had a rough day.A delayed SORRY.:o


http://i199.photobucket.com/albums/aa214/jabarco/Thumbsup.jpg
Jabs

[the mojo]

Wannafreeze, One dump per the customer and it tripped the safety?

Line temps below 85 degrees is a flooded valve not a starved one.

Those dinky dog units can be a pain in the arse and the back but confirm it by dropping two probes on the evap and a third on the thermister.

[Jabarco]

Wannafreeze, One dump per the customer and it tripped the safety?

Line temps below 85 degrees is a flooded valve not a starved one.

Mojo,
True, except if this was the case it would stop after the third consecutive freeze. However, if the thermistor exceeds 255°F (caused by high superheat/starving) for 15 seconds the machine stops immediately (safety limit #4).

Jabs

[the mojo]

Jabs, On the high end it will trip off.

On the low end flooded it takes 3 cycles.




















































And on the lowest end I did'nt see it was an old post early in the morning.:eek:

[Jabarco]

Jabs, On the high end it will trip off.

On the low end flooded it takes 3 cycles.



That's what I've been saying.

Jabs

[idontgetit]

I think it needs a new bin switch.

How bout them apples boyz!

[Jabarco]

I think it needs a new bin switch.

How bout them apples boyz!

Then that would be Safety Limit #2.

Jabs

[idontgetit]

Then that would be Safety Limit #2.

Jabs

My bad, read this one and thought it was the OP


bringing up a old thread, but we have the same machine in our shop. We don't do refrigeration, but our machine runs for 2-3 days and will stop with a #2. We cleaned the coil but still run into this problem.